fs/proc/proc_misc.c

   1 /*
   2  *  linux/fs/proc/proc_misc.c
   3  *
   4  *  linux/fs/proc/array.c
   5  *  Copyright (C) 1992  by Linus Torvalds
   6  *  based on ideas by Darren Senn
   7  *
   8  *  This used to be the part of array.c. See the rest of history and credits
   9  *  there. I took this into a separate file and switched the thing to generic
  10  *  proc_file_inode_operations, leaving in array.c only per-process stuff.
  11  *  Inumbers allocation made dynamic (via create_proc_entry()).  AV, May 1999.
  12  *
  13  * Changes:
  14  * Fulton Green      :  Encapsulated position metric calculations.
  15  *                      <kernel@FultonGreen.com>
  16  */
  17
  18 #include <linux/types.h>
  19 #include <linux/errno.h>
  20 #include <linux/time.h>
  21 #include <linux/kernel.h>
  22 #include <linux/kernel_stat.h>
  23 #include <linux/fs.h>
  24 #include <linux/tty.h>
  25 #include <linux/string.h>
  26 #include <linux/mman.h>
  27 #include <linux/quicklist.h>
  28 #include <linux/proc_fs.h>
  29 #include <linux/ioport.h>
  30 #include <linux/mm.h>
  31 #include <linux/mmzone.h>
  32 #include <linux/pagemap.h>
  33 #include <linux/irq.h>
  34 #include <linux/interrupt.h>
  35 #include <linux/swap.h>
  36 #include <linux/slab.h>
  37 #include <linux/genhd.h>
  38 #include <linux/smp.h>
  39 #include <linux/signal.h>
  40 #include <linux/module.h>
  41 #include <linux/init.h>
  42 #include <linux/seq_file.h>
  43 #include <linux/times.h>
  44 #include <linux/profile.h>
  45 #include <linux/utsname.h>
  46 #include <linux/blkdev.h>
  47 #include <linux/hugetlb.h>
  48 #include <linux/jiffies.h>
  49 #include <linux/sysrq.h>
  50 #include <linux/vmalloc.h>
  51 #include <linux/crash_dump.h>
  52 #include <linux/pid_namespace.h>
  53 #include <linux/bootmem.h>
  54 #include <asm/uaccess.h>
  55 #include <asm/pgtable.h>
  56 #include <asm/io.h>
  57 #include <asm/tlb.h>
  58 #include <asm/div64.h>
  59 #include "internal.h"
  60
  61 #define LOAD_INT(x) ((x) >> FSHIFT)
  62 #define LOAD_FRAC(x) LOAD_INT(((x) & (FIXED_1-1)) * 100)
  63 /*
  64  * Warning: stuff below (imported functions) assumes that its output will fit
  65  * into one page. For some of those functions it may be wrong. Moreover, we
  66  * have a way to deal with that gracefully. Right now I used straightforward
  67  * wrappers, but this needs further analysis wrt potential overflows.
  68  */
  69 extern int get_hardware_list(char *);
  70 extern int get_stram_list(char *);
  71 extern int get_exec_domain_list(char *);
  72
  73 static int proc_calc_metrics(char *page, char **start, off_t off,
  74                                  int count, int *eof, int len)
  75 {
  76         if (len <= off+count) *eof = 1;
  77         *start = page + off;
  78         len -= off;
  79         if (len>count) len = count;
  80         if (len<0) len = 0;
  81         return len;
  82 }
  83
  84 static int loadavg_read_proc(char *page, char **start, off_t off,
  85                                  int count, int *eof, void *data)
  86 {
  87         int a, b, c;
  88         int len;
  89         unsigned long seq;
  90
  91         do {
  92                 seq = read_seqbegin(&xtime_lock);
  93                 a = avenrun[0] + (FIXED_1/200);
  94                 b = avenrun[1] + (FIXED_1/200);
  95                 c = avenrun[2] + (FIXED_1/200);
  96         } while (read_seqretry(&xtime_lock, seq));
  97
  98         len = sprintf(page,"%d.%02d %d.%02d %d.%02d %ld/%d %d\n",
  99                 LOAD_INT(a), LOAD_FRAC(a),
 100                 LOAD_INT(b), LOAD_FRAC(b),
 101                 LOAD_INT(c), LOAD_FRAC(c),
 102                 nr_running(), nr_threads,
 103                 task_active_pid_ns(current)->last_pid);
 104         return proc_calc_metrics(page, start, off, count, eof, len);
 105 }
 106
 107 static int uptime_read_proc(char *page, char **start, off_t off,
 108                                  int count, int *eof, void *data)
 109 {
 110         struct timespec uptime;
 111         struct timespec idle;
 112         int len;
 113         cputime_t idletime = cputime_add(init_task.utime, init_task.stime);
 114
 115         do_posix_clock_monotonic_gettime(&uptime);
 116         monotonic_to_bootbased(&uptime);
 117         cputime_to_timespec(idletime, &idle);
 118         len = sprintf(page,"%lu.%02lu %lu.%02lu\n",
 119                         (unsigned long) uptime.tv_sec,
 120                         (uptime.tv_nsec / (NSEC_PER_SEC / 100)),
 121                         (unsigned long) idle.tv_sec,
 122                         (idle.tv_nsec / (NSEC_PER_SEC / 100)));
 123
 124         return proc_calc_metrics(page, start, off, count, eof, len);
 125 }
 126
 127 int __attribute__((weak)) arch_report_meminfo(char *page)
 128 {
 129         return 0;
 130 }
 131
 132 static int meminfo_read_proc(char *page, char **start, off_t off,
 133                                  int count, int *eof, void *data)
 134 {
 135         struct sysinfo i;
 136         int len;
 137         unsigned long committed;
 138         unsigned long allowed;
 139         struct vmalloc_info vmi;
 140         long cached;
 141
 142 /*
 143  * display in kilobytes.
 144  */
 145 #define K(x) ((x) << (PAGE_SHIFT - 10))
 146         si_meminfo(&i);
 147         si_swapinfo(&i);
 148         committed = atomic_long_read(&vm_committed_space);
 149         allowed = ((totalram_pages - hugetlb_total_pages())
 150                 * sysctl_overcommit_ratio / 100) + total_swap_pages;
 151
 152         cached = global_page_state(NR_FILE_PAGES) -
 153                         total_swapcache_pages - i.bufferram;
 154         if (cached < 0)
 155                 cached = 0;
 156
 157         get_vmalloc_info(&vmi);
 158
 159         /*
 160          * Tagged format, for easy grepping and expansion.
 161          */
 162         len = sprintf(page,
 163                 "MemTotal:     %8lu kB\n"
 164                 "MemFree:      %8lu kB\n"
 165                 "Buffers:      %8lu kB\n"
 166                 "Cached:       %8lu kB\n"
 167                 "SwapCached:   %8lu kB\n"
 168                 "Active:       %8lu kB\n"
 169                 "Inactive:     %8lu kB\n"
 170 #ifdef CONFIG_HIGHMEM
 171                 "HighTotal:    %8lu kB\n"
 172                 "HighFree:     %8lu kB\n"
 173                 "LowTotal:     %8lu kB\n"
 174                 "LowFree:      %8lu kB\n"
 175 #endif
 176                 "SwapTotal:    %8lu kB\n"
 177                 "SwapFree:     %8lu kB\n"
 178                 "Dirty:        %8lu kB\n"
 179                 "Writeback:    %8lu kB\n"
 180                 "AnonPages:    %8lu kB\n"
 181                 "Mapped:       %8lu kB\n"
 182                 "Slab:         %8lu kB\n"
 183                 "SReclaimable: %8lu kB\n"
 184                 "SUnreclaim:   %8lu kB\n"
 185                 "PageTables:   %8lu kB\n"
 186 #ifdef CONFIG_QUICKLIST
 187                 "Quicklists:   %8lu kB\n"
 188 #endif
 189                 "NFS_Unstable: %8lu kB\n"
 190                 "Bounce:       %8lu kB\n"
 191                 "WritebackTmp: %8lu kB\n"
 192                 "CommitLimit:  %8lu kB\n"
 193                 "Committed_AS: %8lu kB\n"
 194                 "VmallocTotal: %8lu kB\n"
 195                 "VmallocUsed:  %8lu kB\n"
 196                 "VmallocChunk: %8lu kB\n",
 197                 K(i.totalram),
 198                 K(i.freeram),
 199                 K(i.bufferram),
 200                 K(cached),
 201                 K(total_swapcache_pages),
 202                 K(global_page_state(NR_ACTIVE)),
 203                 K(global_page_state(NR_INACTIVE)),
 204 #ifdef CONFIG_HIGHMEM
 205                 K(i.totalhigh),
 206                 K(i.freehigh),
 207                 K(i.totalram-i.totalhigh),
 208                 K(i.freeram-i.freehigh),
 209 #endif
 210                 K(i.totalswap),
 211                 K(i.freeswap),
 212                 K(global_page_state(NR_FILE_DIRTY)),
 213                 K(global_page_state(NR_WRITEBACK)),
 214                 K(global_page_state(NR_ANON_PAGES)),
 215                 K(global_page_state(NR_FILE_MAPPED)),
 216                 K(global_page_state(NR_SLAB_RECLAIMABLE) +
 217                                 global_page_state(NR_SLAB_UNRECLAIMABLE)),
 218                 K(global_page_state(NR_SLAB_RECLAIMABLE)),
 219                 K(global_page_state(NR_SLAB_UNRECLAIMABLE)),
 220                 K(global_page_state(NR_PAGETABLE)),
 221 #ifdef CONFIG_QUICKLIST
 222                 K(quicklist_total_size()),
 223 #endif
 224                 K(global_page_state(NR_UNSTABLE_NFS)),
 225                 K(global_page_state(NR_BOUNCE)),
 226                 K(global_page_state(NR_WRITEBACK_TEMP)),
 227                 K(allowed),
 228                 K(committed),
 229                 (unsigned long)VMALLOC_TOTAL >> 10,
 230                 vmi.used >> 10,
 231                 vmi.largest_chunk >> 10
 232                 );
 233
 234                 len += hugetlb_report_meminfo(page + len);
 235
 236         len += arch_report_meminfo(page + len);
 237
 238         return proc_calc_metrics(page, start, off, count, eof, len);
 239 #undef K
 240 }
 241
 242 static int fragmentation_open(struct inode *inode, struct file *file)
 243 {
 244         (void)inode;
 245         return seq_open(file, &fragmentation_op);
 246 }
 247
 248 static const struct file_operations fragmentation_file_operations = {
 249         .open           = fragmentation_open,
 250         .read           = seq_read,
 251         .llseek         = seq_lseek,
 252         .release        = seq_release,
 253 };
 254
 255 static int pagetypeinfo_open(struct inode *inode, struct file *file)
 256 {
 257         return seq_open(file, &pagetypeinfo_op);
 258 }
 259
 260 static const struct file_operations pagetypeinfo_file_ops = {
 261         .open           = pagetypeinfo_open,
 262         .read           = seq_read,
 263         .llseek         = seq_lseek,
 264         .release        = seq_release,
 265 };
 266
 267 static int zoneinfo_open(struct inode *inode, struct file *file)
 268 {
 269         return seq_open(file, &zoneinfo_op);
 270 }
 271
 272 static const struct file_operations proc_zoneinfo_file_operations = {
 273         .open           = zoneinfo_open,
 274         .read           = seq_read,
 275         .llseek         = seq_lseek,
 276         .release        = seq_release,
 277 };
 278
 279 static int version_read_proc(char *page, char **start, off_t off,
 280                                  int count, int *eof, void *data)
 281 {
 282         int len;
 283
 284         len = snprintf(page, PAGE_SIZE, linux_proc_banner,
 285                 utsname()->sysname,
 286                 utsname()->release,
 287                 utsname()->version);
 288         return proc_calc_metrics(page, start, off, count, eof, len);
 289 }
 290
 291 extern const struct seq_operations cpuinfo_op;
 292 static int cpuinfo_open(struct inode *inode, struct file *file)
 293 {
 294         return seq_open(file, &cpuinfo_op);
 295 }
 296
 297 static const struct file_operations proc_cpuinfo_operations = {
 298         .open           = cpuinfo_open,
 299         .read           = seq_read,
 300         .llseek         = seq_lseek,
 301         .release        = seq_release,
 302 };
 303
 304 static int devinfo_show(struct seq_file *f, void *v)
 305 {
 306         int i = *(loff_t *) v;
 307
 308         if (i < CHRDEV_MAJOR_HASH_SIZE) {
 309                 if (i == 0)
 310                         seq_printf(f, "Character devices:\n");
 311                 chrdev_show(f, i);
 312         }
 313 #ifdef CONFIG_BLOCK
 314         else {
 315                 i -= CHRDEV_MAJOR_HASH_SIZE;
 316                 if (i == 0)
 317                         seq_printf(f, "\nBlock devices:\n");
 318                 blkdev_show(f, i);
 319         }
 320 #endif
 321         return 0;
 322 }
 323
 324 static void *devinfo_start(struct seq_file *f, loff_t *pos)
 325 {
 326         if (*pos < (BLKDEV_MAJOR_HASH_SIZE + CHRDEV_MAJOR_HASH_SIZE))
 327                 return pos;
 328         return NULL;
 329 }
 330
 331 static void *devinfo_next(struct seq_file *f, void *v, loff_t *pos)
 332 {
 333         (*pos)++;
 334         if (*pos >= (BLKDEV_MAJOR_HASH_SIZE + CHRDEV_MAJOR_HASH_SIZE))
 335                 return NULL;
 336         return pos;
 337 }
 338
 339 static void devinfo_stop(struct seq_file *f, void *v)
 340 {
 341         /* Nothing to do */
 342 }
 343
 344 static const struct seq_operations devinfo_ops = {
 345         .start = devinfo_start,
 346         .next  = devinfo_next,
 347         .stop  = devinfo_stop,
 348         .show  = devinfo_show
 349 };
 350
 351 static int devinfo_open(struct inode *inode, struct file *filp)
 352 {
 353         return seq_open(filp, &devinfo_ops);
 354 }
 355
 356 static const struct file_operations proc_devinfo_operations = {
 357         .open           = devinfo_open,
 358         .read           = seq_read,
 359         .llseek         = seq_lseek,
 360         .release        = seq_release,
 361 };
 362
 363 static int vmstat_open(struct inode *inode, struct file *file)
 364 {
 365         return seq_open(file, &vmstat_op);
 366 }
 367 static const struct file_operations proc_vmstat_file_operations = {
 368         .open           = vmstat_open,
 369         .read           = seq_read,
 370         .llseek         = seq_lseek,
 371         .release        = seq_release,
 372 };
 373
 374 #ifdef CONFIG_PROC_HARDWARE
 375 static int hardware_read_proc(char *page, char **start, off_t off,
 376                                  int count, int *eof, void *data)
 377 {
 378         int len = get_hardware_list(page);
 379         return proc_calc_metrics(page, start, off, count, eof, len);
 380 }
 381 #endif
 382
 383 #ifdef CONFIG_STRAM_PROC
 384 static int stram_read_proc(char *page, char **start, off_t off,
 385                                  int count, int *eof, void *data)
 386 {
 387         int len = get_stram_list(page);
 388         return proc_calc_metrics(page, start, off, count, eof, len);
 389 }
 390 #endif
 391
 392 #ifdef CONFIG_BLOCK
 393 static int partitions_open(struct inode *inode, struct file *file)
 394 {
 395         return seq_open(file, &partitions_op);
 396 }
 397 static const struct file_operations proc_partitions_operations = {
 398         .open           = partitions_open,
 399         .read           = seq_read,
 400         .llseek         = seq_lseek,
 401         .release        = seq_release,
 402 };
 403
 404 static int diskstats_open(struct inode *inode, struct file *file)
 405 {
 406         return seq_open(file, &diskstats_op);
 407 }
 408 static const struct file_operations proc_diskstats_operations = {
 409         .open           = diskstats_open,
 410         .read           = seq_read,
 411         .llseek         = seq_lseek,
 412         .release        = seq_release,
 413 };
 414 #endif
 415
 416 #ifdef CONFIG_MODULES
 417 extern const struct seq_operations modules_op;
 418 static int modules_open(struct inode *inode, struct file *file)
 419 {
 420         return seq_open(file, &modules_op);
 421 }
 422 static const struct file_operations proc_modules_operations = {
 423         .open           = modules_open,
 424         .read           = seq_read,
 425         .llseek         = seq_lseek,
 426         .release        = seq_release,
 427 };
 428 #endif
 429
 430 #ifdef CONFIG_SLABINFO
 431 static int slabinfo_open(struct inode *inode, struct file *file)
 432 {
 433         return seq_open(file, &slabinfo_op);
 434 }
 435 static const struct file_operations proc_slabinfo_operations = {
 436         .open           = slabinfo_open,
 437         .read           = seq_read,
 438         .write          = slabinfo_write,
 439         .llseek         = seq_lseek,
 440         .release        = seq_release,
 441 };
 442
 443 #ifdef CONFIG_DEBUG_SLAB_LEAK
 444 extern const struct seq_operations slabstats_op;
 445 static int slabstats_open(struct inode *inode, struct file *file)
 446 {
 447         unsigned long *n = kzalloc(PAGE_SIZE, GFP_KERNEL);
 448         int ret = -ENOMEM;
 449         if (n) {
 450                 ret = seq_open(file, &slabstats_op);
 451                 if (!ret) {
 452                         struct seq_file *m = file->private_data;
 453                         *n = PAGE_SIZE / (2 * sizeof(unsigned long));
 454                         m->private = n;
 455                         n = NULL;
 456                 }
 457                 kfree(n);
 458         }
 459         return ret;
 460 }
 461
 462 static const struct file_operations proc_slabstats_operations = {
 463         .open           = slabstats_open,
 464         .read           = seq_read,
 465         .llseek         = seq_lseek,
 466         .release        = seq_release_private,
 467 };
 468 #endif
 469 #endif
 470
 471 #ifdef CONFIG_MMU
 472 static int vmalloc_open(struct inode *inode, struct file *file)
 473 {
 474         unsigned int *ptr = NULL;
 475         int ret;
 476
 477         if (NUMA_BUILD)
 478                 ptr = kmalloc(nr_node_ids * sizeof(unsigned int), GFP_KERNEL);
 479         ret = seq_open(file, &vmalloc_op);
 480         if (!ret) {
 481                 struct seq_file *m = file->private_data;
 482                 m->private = ptr;
 483         } else
 484                 kfree(ptr);
 485         return ret;
 486 }
 487
 488 static const struct file_operations proc_vmalloc_operations = {
 489         .open           = vmalloc_open,
 490         .read           = seq_read,
 491         .llseek         = seq_lseek,
 492         .release        = seq_release_private,
 493 };
 494 #endif
 495
 496 #ifndef arch_irq_stat_cpu
 497 #define arch_irq_stat_cpu(cpu) 0
 498 #endif
 499 #ifndef arch_irq_stat
 500 #define arch_irq_stat() 0
 501 #endif
 502
 503 static int show_stat(struct seq_file *p, void *v)
 504 {
 505         int i, j;
 506         unsigned long jif;
 507         cputime64_t user, nice, system, idle, iowait, irq, softirq, steal;
 508         cputime64_t guest;
 509         u64 sum = 0;
 510         struct timespec boottime;
 511         unsigned int per_irq_sum;
 512 #ifdef CONFIG_GENERIC_HARDIRQS
 513         struct irq_desc *desc;
 514 #endif
 515
 516         user = nice = system = idle = iowait =
 517                 irq = softirq = steal = cputime64_zero;
 518         guest = cputime64_zero;
 519         getboottime(&boottime);
 520         jif = boottime.tv_sec;
 521
 522         for_each_possible_cpu(i) {
 523                 user = cputime64_add(user, kstat_cpu(i).cpustat.user);
 524                 nice = cputime64_add(nice, kstat_cpu(i).cpustat.nice);
 525                 system = cputime64_add(system, kstat_cpu(i).cpustat.system);
 526                 idle = cputime64_add(idle, kstat_cpu(i).cpustat.idle);
 527                 iowait = cputime64_add(iowait, kstat_cpu(i).cpustat.iowait);
 528                 irq = cputime64_add(irq, kstat_cpu(i).cpustat.irq);
 529                 softirq = cputime64_add(softirq, kstat_cpu(i).cpustat.softirq);
 530                 steal = cputime64_add(steal, kstat_cpu(i).cpustat.steal);
 531                 guest = cputime64_add(guest, kstat_cpu(i).cpustat.guest);
 532
 533                 for_each_irq_desc(j, desc)
 534                         sum += kstat_irqs_cpu(j, i);
 535
 536                 sum += arch_irq_stat_cpu(i);
 537         }
 538         sum += arch_irq_stat();
 539
 540         seq_printf(p, "cpu  %llu %llu %llu %llu %llu %llu %llu %llu %llu\n",
 541                 (unsigned long long)cputime64_to_clock_t(user),
 542                 (unsigned long long)cputime64_to_clock_t(nice),
 543                 (unsigned long long)cputime64_to_clock_t(system),
 544                 (unsigned long long)cputime64_to_clock_t(idle),
 545                 (unsigned long long)cputime64_to_clock_t(iowait),
 546                 (unsigned long long)cputime64_to_clock_t(irq),
 547                 (unsigned long long)cputime64_to_clock_t(softirq),
 548                 (unsigned long long)cputime64_to_clock_t(steal),
 549                 (unsigned long long)cputime64_to_clock_t(guest));
 550         for_each_online_cpu(i) {
 551
 552                 /* Copy values here to work around gcc-2.95.3, gcc-2.96 */
 553                 user = kstat_cpu(i).cpustat.user;
 554                 nice = kstat_cpu(i).cpustat.nice;
 555                 system = kstat_cpu(i).cpustat.system;
 556                 idle = kstat_cpu(i).cpustat.idle;
 557                 iowait = kstat_cpu(i).cpustat.iowait;
 558                 irq = kstat_cpu(i).cpustat.irq;
 559                 softirq = kstat_cpu(i).cpustat.softirq;
 560                 steal = kstat_cpu(i).cpustat.steal;
 561                 guest = kstat_cpu(i).cpustat.guest;
 562                 seq_printf(p,
 563                         "cpu%d %llu %llu %llu %llu %llu %llu %llu %llu %llu\n",
 564                         i,
 565                         (unsigned long long)cputime64_to_clock_t(user),
 566                         (unsigned long long)cputime64_to_clock_t(nice),
 567                         (unsigned long long)cputime64_to_clock_t(system),
 568                         (unsigned long long)cputime64_to_clock_t(idle),
 569                         (unsigned long long)cputime64_to_clock_t(iowait),
 570                         (unsigned long long)cputime64_to_clock_t(irq),
 571                         (unsigned long long)cputime64_to_clock_t(softirq),
 572                         (unsigned long long)cputime64_to_clock_t(steal),
 573                         (unsigned long long)cputime64_to_clock_t(guest));
 574         }
 575         seq_printf(p, "intr %llu", (unsigned long long)sum);
 576
 577         /* sum again ? it could be updated? */
 578         for_each_irq_desc(j, desc) {
 579                 per_irq_sum = 0;
 580
 581                 for_each_possible_cpu(i)
 582                         per_irq_sum += kstat_irqs_cpu(j, i);
 583
 584                 seq_printf(p, " %u", per_irq_sum);
 585         }
 586
 587         seq_printf(p,
 588                 "\nctxt %llu\n"
 589                 "btime %lu\n"
 590                 "processes %lu\n"
 591                 "procs_running %lu\n"
 592                 "procs_blocked %lu\n",
 593                 nr_context_switches(),
 594                 (unsigned long)jif,
 595                 total_forks,
 596                 nr_running(),
 597                 nr_iowait());
 598
 599         return 0;
 600 }
 601
 602 static int stat_open(struct inode *inode, struct file *file)
 603 {
 604         unsigned size = 4096 * (1 + num_possible_cpus() / 32);
 605         char *buf;
 606         struct seq_file *m;
 607         int res;
 608
 609         /* don't ask for more than the kmalloc() max size, currently 128 KB */
 610         if (size > 128 * 1024)
 611                 size = 128 * 1024;
 612         buf = kmalloc(size, GFP_KERNEL);
 613         if (!buf)
 614                 return -ENOMEM;
 615
 616         res = single_open(file, show_stat, NULL);
 617         if (!res) {
 618                 m = file->private_data;
 619                 m->buf = buf;
 620                 m->size = size;
 621         } else
 622                 kfree(buf);
 623         return res;
 624 }
 625 static const struct file_operations proc_stat_operations = {
 626         .open           = stat_open,
 627         .read           = seq_read,
 628         .llseek         = seq_lseek,
 629         .release        = single_release,
 630 };
 631
 632 /*
 633  * /proc/interrupts
 634  */
 635 static void *int_seq_start(struct seq_file *f, loff_t *pos)
 636 {
 637         return (*pos <= nr_irqs) ? pos : NULL;
 638 }
 639
 640
 641 static void *int_seq_next(struct seq_file *f, void *v, loff_t *pos)
 642 {
 643         (*pos)++;
 644         return (*pos <= nr_irqs) ? pos : NULL;
 645 }
 646
 647 static void int_seq_stop(struct seq_file *f, void *v)
 648 {
 649         /* Nothing to do */
 650 }
 651
 652 static const struct seq_operations int_seq_ops = {
 653         .start = int_seq_start,
 654         .next  = int_seq_next,
 655         .stop  = int_seq_stop,
 656         .show  = show_interrupts
 657 };
 658
 659 static int interrupts_open(struct inode *inode, struct file *filp)
 660 {
 661         return seq_open(filp, &int_seq_ops);
 662 }
 663
 664 static const struct file_operations proc_interrupts_operations = {
 665         .open           = interrupts_open,
 666         .read           = seq_read,
 667         .llseek         = seq_lseek,
 668         .release        = seq_release,
 669 };
 670
 671 static int filesystems_read_proc(char *page, char **start, off_t off,
 672                                  int count, int *eof, void *data)
 673 {
 674         int len = get_filesystem_list(page);
 675         return proc_calc_metrics(page, start, off, count, eof, len);
 676 }
 677
 678 static int cmdline_read_proc(char *page, char **start, off_t off,
 679                                  int count, int *eof, void *data)
 680 {
 681         int len;
 682
 683         len = sprintf(page, "%s\n", saved_command_line);
 684         return proc_calc_metrics(page, start, off, count, eof, len);
 685 }
 686
 687 #ifdef CONFIG_FILE_LOCKING
 688 static int locks_open(struct inode *inode, struct file *filp)
 689 {
 690         return seq_open(filp, &locks_seq_operations);
 691 }
 692
 693 static const struct file_operations proc_locks_operations = {
 694         .open           = locks_open,
 695         .read           = seq_read,
 696         .llseek         = seq_lseek,
 697         .release        = seq_release,
 698 };
 699 #endif /* CONFIG_FILE_LOCKING */
 700
 701 static int execdomains_read_proc(char *page, char **start, off_t off,
 702                                  int count, int *eof, void *data)
 703 {
 704         int len = get_exec_domain_list(page);
 705         return proc_calc_metrics(page, start, off, count, eof, len);
 706 }
 707
 708 #ifdef CONFIG_MAGIC_SYSRQ
 709 /*
 710  * writing 'C' to /proc/sysrq-trigger is like sysrq-C
 711  */
 712 static ssize_t write_sysrq_trigger(struct file *file, const char __user *buf,
 713                                    size_t count, loff_t *ppos)
 714 {
 715         if (count) {
 716                 char c;
 717
 718                 if (get_user(c, buf))
 719                         return -EFAULT;
 720                 __handle_sysrq(c, NULL, 0);
 721         }
 722         return count;
 723 }
 724
 725 static const struct file_operations proc_sysrq_trigger_operations = {
 726         .write          = write_sysrq_trigger,
 727 };
 728 #endif
 729
 730 #ifdef CONFIG_PROC_PAGE_MONITOR
 731 #define KPMSIZE sizeof(u64)
 732 #define KPMMASK (KPMSIZE - 1)
 733 /* /proc/kpagecount - an array exposing page counts
 734  *
 735  * Each entry is a u64 representing the corresponding
 736  * physical page count.
 737  */
 738 static ssize_t kpagecount_read(struct file *file, char __user *buf,
 739                              size_t count, loff_t *ppos)
 740 {
 741         u64 __user *out = (u64 __user *)buf;
 742         struct page *ppage;
 743         unsigned long src = *ppos;
 744         unsigned long pfn;
 745         ssize_t ret = 0;
 746         u64 pcount;
 747
 748         pfn = src / KPMSIZE;
 749         count = min_t(size_t, count, (max_pfn * KPMSIZE) - src);
 750         if (src & KPMMASK || count & KPMMASK)
 751                 return -EINVAL;
 752
 753         while (count > 0) {
 754                 ppage = NULL;
 755                 if (pfn_valid(pfn))
 756                         ppage = pfn_to_page(pfn);
 757                 pfn++;
 758                 if (!ppage)
 759                         pcount = 0;
 760                 else
 761                         pcount = page_mapcount(ppage);
 762
 763                 if (put_user(pcount, out++)) {
 764                         ret = -EFAULT;
 765                         break;
 766                 }
 767
 768                 count -= KPMSIZE;
 769         }
 770
 771         *ppos += (char __user *)out - buf;
 772         if (!ret)
 773                 ret = (char __user *)out - buf;
 774         return ret;
 775 }
 776
 777 static struct file_operations proc_kpagecount_operations = {
 778         .llseek = mem_lseek,
 779         .read = kpagecount_read,
 780 };
 781
 782 /* /proc/kpageflags - an array exposing page flags
 783  *
 784  * Each entry is a u64 representing the corresponding
 785  * physical page flags.
 786  */
 787
 788 /* These macros are used to decouple internal flags from exported ones */
 789
 790 #define KPF_LOCKED     0
 791 #define KPF_ERROR      1
 792 #define KPF_REFERENCED 2
 793 #define KPF_UPTODATE   3
 794 #define KPF_DIRTY      4
 795 #define KPF_LRU        5
 796 #define KPF_ACTIVE     6
 797 #define KPF_SLAB       7
 798 #define KPF_WRITEBACK  8
 799 #define KPF_RECLAIM    9
 800 #define KPF_BUDDY     10
 801
 802 #define kpf_copy_bit(flags, srcpos, dstpos) (((flags >> srcpos) & 1) << dstpos)
 803
 804 static ssize_t kpageflags_read(struct file *file, char __user *buf,
 805                              size_t count, loff_t *ppos)
 806 {
 807         u64 __user *out = (u64 __user *)buf;
 808         struct page *ppage;
 809         unsigned long src = *ppos;
 810         unsigned long pfn;
 811         ssize_t ret = 0;
 812         u64 kflags, uflags;
 813
 814         pfn = src / KPMSIZE;
 815         count = min_t(unsigned long, count, (max_pfn * KPMSIZE) - src);
 816         if (src & KPMMASK || count & KPMMASK)
 817                 return -EINVAL;
 818
 819         while (count > 0) {
 820                 ppage = NULL;
 821                 if (pfn_valid(pfn))
 822                         ppage = pfn_to_page(pfn);
 823                 pfn++;
 824                 if (!ppage)
 825                         kflags = 0;
 826                 else
 827                         kflags = ppage->flags;
 828
 829                 uflags = kpf_copy_bit(KPF_LOCKED, PG_locked, kflags) |
 830                         kpf_copy_bit(kflags, KPF_ERROR, PG_error) |
 831                         kpf_copy_bit(kflags, KPF_REFERENCED, PG_referenced) |
 832                         kpf_copy_bit(kflags, KPF_UPTODATE, PG_uptodate) |
 833                         kpf_copy_bit(kflags, KPF_DIRTY, PG_dirty) |
 834                         kpf_copy_bit(kflags, KPF_LRU, PG_lru) |
 835                         kpf_copy_bit(kflags, KPF_ACTIVE, PG_active) |
 836                         kpf_copy_bit(kflags, KPF_SLAB, PG_slab) |
 837                         kpf_copy_bit(kflags, KPF_WRITEBACK, PG_writeback) |
 838                         kpf_copy_bit(kflags, KPF_RECLAIM, PG_reclaim) |
 839                         kpf_copy_bit(kflags, KPF_BUDDY, PG_buddy);
 840
 841                 if (put_user(uflags, out++)) {
 842                         ret = -EFAULT;
 843                         break;
 844                 }
 845
 846                 count -= KPMSIZE;
 847         }
 848
 849         *ppos += (char __user *)out - buf;
 850         if (!ret)
 851                 ret = (char __user *)out - buf;
 852         return ret;
 853 }
 854
 855 static struct file_operations proc_kpageflags_operations = {
 856         .llseek = mem_lseek,
 857         .read = kpageflags_read,
 858 };
 859 #endif /* CONFIG_PROC_PAGE_MONITOR */
 860
 861 struct proc_dir_entry *proc_root_kcore;
 862
 863 void __init proc_misc_init(void)
 864 {
 865         static struct {
 866                 char *name;
 867                 int (*read_proc)(char*,char**,off_t,int,int*,void*);
 868         } *p, simple_ones[] = {
 869                 {"loadavg",     loadavg_read_proc},
 870                 {"uptime",      uptime_read_proc},
 871                 {"meminfo",     meminfo_read_proc},
 872                 {"version",     version_read_proc},
 873 #ifdef CONFIG_PROC_HARDWARE
 874                 {"hardware",    hardware_read_proc},
 875 #endif
 876 #ifdef CONFIG_STRAM_PROC
 877                 {"stram",       stram_read_proc},
 878 #endif
 879                 {"filesystems", filesystems_read_proc},
 880                 {"cmdline",     cmdline_read_proc},
 881                 {"execdomains", execdomains_read_proc},
 882                 {NULL,}
 883         };
 884         for (p = simple_ones; p->name; p++)
 885                 create_proc_read_entry(p->name, 0, NULL, p->read_proc, NULL);
 886
 887         proc_symlink("mounts", NULL, "self/mounts");
 888
 889         /* And now for trickier ones */
 890 #ifdef CONFIG_PRINTK
 891         proc_create("kmsg", S_IRUSR, NULL, &proc_kmsg_operations);
 892 #endif
 893 #ifdef CONFIG_FILE_LOCKING
 894         proc_create("locks", 0, NULL, &proc_locks_operations);
 895 #endif
 896         proc_create("devices", 0, NULL, &proc_devinfo_operations);
 897         proc_create("cpuinfo", 0, NULL, &proc_cpuinfo_operations);
 898 #ifdef CONFIG_BLOCK
 899         proc_create("partitions", 0, NULL, &proc_partitions_operations);
 900 #endif
 901         proc_create("stat", 0, NULL, &proc_stat_operations);
 902         proc_create("interrupts", 0, NULL, &proc_interrupts_operations);
 903 #ifdef CONFIG_SLABINFO
 904         proc_create("slabinfo",S_IWUSR|S_IRUGO,NULL,&proc_slabinfo_operations);
 905 #ifdef CONFIG_DEBUG_SLAB_LEAK
 906         proc_create("slab_allocators", 0, NULL, &proc_slabstats_operations);
 907 #endif
 908 #endif
 909 #ifdef CONFIG_MMU
 910         proc_create("vmallocinfo", S_IRUSR, NULL, &proc_vmalloc_operations);
 911 #endif
 912         proc_create("buddyinfo", S_IRUGO, NULL, &fragmentation_file_operations);
 913         proc_create("pagetypeinfo", S_IRUGO, NULL, &pagetypeinfo_file_ops);
 914         proc_create("vmstat", S_IRUGO, NULL, &proc_vmstat_file_operations);
 915         proc_create("zoneinfo", S_IRUGO, NULL, &proc_zoneinfo_file_operations);
 916 #ifdef CONFIG_BLOCK
 917         proc_create("diskstats", 0, NULL, &proc_diskstats_operations);
 918 #endif
 919 #ifdef CONFIG_MODULES
 920         proc_create("modules", 0, NULL, &proc_modules_operations);
 921 #endif
 922 #ifdef CONFIG_SCHEDSTATS
 923         proc_create("schedstat", 0, NULL, &proc_schedstat_operations);
 924 #endif
 925 #ifdef CONFIG_PROC_KCORE
 926         proc_root_kcore = proc_create("kcore", S_IRUSR, NULL, &proc_kcore_operations);
 927         if (proc_root_kcore)
 928                 proc_root_kcore->size =
 929                                 (size_t)high_memory - PAGE_OFFSET + PAGE_SIZE;
 930 #endif
 931 #ifdef CONFIG_PROC_PAGE_MONITOR
 932         proc_create("kpagecount", S_IRUSR, NULL, &proc_kpagecount_operations);
 933         proc_create("kpageflags", S_IRUSR, NULL, &proc_kpageflags_operations);
 934 #endif
 935 #ifdef CONFIG_PROC_VMCORE
 936         proc_vmcore = proc_create("vmcore", S_IRUSR, NULL, &proc_vmcore_operations);
 937 #endif
 938 #ifdef CONFIG_MAGIC_SYSRQ
 939         proc_create("sysrq-trigger", S_IWUSR, NULL, &proc_sysrq_trigger_operations);
 940 #endif
 941 }